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Strain reversible rehabilitation polymer and its preparing process

A polymer and polyurethane technology, applied in the field of reversible repair polymer preparation, can solve the problem of high repair temperature

Inactive Publication Date: 2007-08-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of polymer must be repaired by heating, and the repair temperature is relatively high

Method used

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  • Strain reversible rehabilitation polymer and its preparing process
  • Strain reversible rehabilitation polymer and its preparing process
  • Strain reversible rehabilitation polymer and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 5.071g MDI and 1.676g BDO into a four-necked flask with nitrogen gas, put 50ml of DMF solvent to fully dissolve and stir evenly; react at 25°C, stop the reaction after about 30min; react at 65°C The MDI-BDO hard segment obtained is added dropwise to the DMF solution of 6.417g Polyethylene Glycol-6000 (number average molecular weight is 6000) containing 0.006g catalyst dibutyltin dilaurate, after the reaction is complete, use hot dehydrated alcohol precipitation, Wash, filter, and dry in a vacuum oven at 80° C. for 24 hours to obtain a block polyurethane product. The obtained product was placed in a Soxhlet extractor, and extracted with absolute ethanol for 24 hours to remove unreacted polyethylene glycol to obtain a polyurethane product with a dual continuous phase structure. The recovery efficiency of the impact toughness of this product under strain conditions is 75%.

Embodiment 2

[0018] Add 6.774g MDI and 2.06g BDO into a four-necked flask with nitrogen, put 60ml of DMF solvent to fully dissolve and stir evenly; react at 25°C, stop the reaction after about 25min; react at 60°C The MDI-BDO hard segment obtained is added dropwise to the DMF solution of 8.834g Polyethylene Glycol-1500 (the number average molecular weight is 1500) containing 0.007g catalyst dibutyltin dilaurate, after the reaction is complete, precipitate with hot dehydrated alcohol, Wash, filter, and dry in a vacuum oven at 80° C. for 24 hours to obtain a block polyurethane product. Put the obtained product into a Soxhlet extractor, extract with absolute ethanol for 24 hours, and obtain a polyurethane product after vacuum drying. The repair efficiency of impact toughness under strain conditions is 85%.

Embodiment 3

[0020] Add 7.340g MDI and 2.483g EG into a four-necked flask with nitrogen, put 50ml of DMF solvent to fully dissolve and stir evenly; react at 25°C, stop the reaction after about 30min; react at 65°C The hard segment of MDI-EG is added dropwise to the DMF solution of 11.625g polyethylene glycol-6000 (number average molecular weight is 6000) containing 0.010g catalyst dibutyltin dilaurate, after the reaction is complete, precipitate and wash with hot absolute ethanol , filtered, and dried in a vacuum oven at 80° C. for 24 hours to obtain a block polyurethane product. Put the obtained product into a Soxhlet extractor, extract with absolute ethanol for 24 hours, and obtain a polyurethane product after vacuum drying. The impact toughness repair efficiency under strain conditions was 78%.

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PUM

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Abstract

The invention relates to a reversible restoring polymer and the preparation method, belonging to macromolecular polymer fiels. The constructure of said polymer is demonstrated in construction formula (a), R1 is hard segment polyurethane demonstrated in construction formula (b), R2 is soft segment in formula (c), n is 1- 5, m is 1- 10, and x is 30- 150; the method comprises: dissolving diphenylmethane- 4, 4'- diisocyanate (MDI) monomer and 1, 4- butanediol (BDO) or ethandiol into N, N- dimethyl formamide (DMF), reacting at 20- 32 Deg. C to produce rigid polyurethane with its construction formula (b); dropping produced polyurethane hard segment into carbowax N, N-dimethyl formamide containing catalyst dodecoic acid butyl tin to get hard and soft segment- containing polyurethane. Said polymer can realize self- restore without heating.

Description

technical field [0001] The invention belongs to the field of high molecular polymers, in particular to the preparation of reversible repairing polymers. Background technique [0002] The failure process of polymer materials is from microcracks to cracks, and then the cracks develop to cause material fracture. Without manual intervention, the function of materials that can automatically heal cracks, fill cracks or prevent cracks from developing is called self-protection or self-healing of materials, and materials with this function are called self-protection or self-healing materials. [0003] The initial self-healing material is to introduce micro-containers containing adhesive precursors into the composite material. When cracks are generated in the polymer material, the micro-containers are broken, and the precursors are released and react to form adhesives to fill the cracks, so that the material can be recovered repair. US Patent No. US 6,527,849 discloses a method for ...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G18/00C08G65/00
Inventor 杜中杰杜庆丽张晨励杭泉
Owner BEIJING UNIV OF CHEM TECH
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